131320663 has 4 divisors (see below), whose sum is σ = 134523648. Its totient is φ = 128117680.

The previous prime is 131320633. The next prime is 131320669. The reversal of 131320663 is 366023131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366023131 = 751 ⋅487381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131320663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131320669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1601431 + ... + 1601512.

It is an arithmetic number, because the mean of its divisors is an integer number (33630912).

Almost surely, 2^131320663 is an apocalyptic number.

131320663 is a deficient number, since it is larger than the sum of its proper divisors (3202985).

131320663 is an equidigital number, since it uses as much as digits as its factorization.

131320663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3202984.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 131320663 is about 11459.5228085641. The cubic root of 131320663 is about 508.2893640968.

Adding to 131320663 its reverse (366023131), we get a palindrome (497343794).

The spelling of 131320663 in words is "one hundred thirty-one million, three hundred twenty thousand, six hundred sixty-three".